Is Trump playing chicken with Iran?

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The ceasefire between the US and Iran continues, but so does the blockade of the Strait of Hormuz - both by Iran of most non-Iranian vessels, and by the US of any vessel going to and from Iran. Economists are saying it has turned into a game of chicken - whoever blinks first, loses. Radio 4 presenters Sarah Montague and Evan Davis discuss how the US and Iran might play the game moving forward.